Calculate the price elasticity of demand for each of these demand curves at QD= 4 and again

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Calculate the price elasticity of demand for each of these demand curves at QD= 4 and again at QD= 8:

a. P = 40 — 2QD

b. P = 24 — QD

c. P = 10 — QD

d. P = 25 — 3QD

e. P=120—10QD

f. Is there a pattern about whether demand is more elastic at QD= 4 or QD= 8?

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